Some HP laptops have a mute mute LED controlled by a pin VREF. The Realtek codec driver updates the VREF via vmaster hook by calling snd_hda_set_pin_ctl_cache(). This works fine as long as the driver is running in a normal mode. However, when the VREF change happens during the codec being in runtime PM suspend, the regmap access will skip and postpone the actual register change. This ends up with the unchanged LED status until the next runtime PM resume even if you change the Master mute switch. (Interestingly, the machine keeps the LED status even after the codec goes into D3 -- but it's another story.) For improving this usability, let the driver temporarily powering up / down only during the pin VREF change. This can be achieved easily by wrapping the call with snd_hda_power_up_pm() / *_down_pm().
Unified · Split
| @@ -3596,8 +3596,12 @@ static void alc269_fixup_mic_mute_hook(void *private_data, int enabled) · 3595 unmodified lines | ||
| 3596 | 3596 | pinval = snd_hda_codec_get_pin_target(codec, spec->mute_led_nid); |
| 3597 | 3597 | pinval &= ~AC_PINCTL_VREFEN; |
| 3598 | 3598 | pinval |= enabled ? AC_PINCTL_VREF_HIZ : AC_PINCTL_VREF_80; |
| 3599 | − if (spec->mute_led_nid) | |
| 3599 | + if (spec->mute_led_nid) { | |
| 3600 | + /* temporarily power up/down for setting VREF */ | |
| 3601 | + snd_hda_power_up_pm(codec); | |
| 3600 | 3602 | snd_hda_set_pin_ctl_cache(codec, spec->mute_led_nid, pinval); |
| 3603 | + snd_hda_power_down_pm(codec); | |
| 3604 | + } | |
| 3601 | 3605 | } |
| 3602 | 3606 | |
| 3603 | 3607 | /* Make sure the led works even in runtime suspend */ |